I am getting fed up now with Sony players...I used to have the NWMS90D players and had the same problem sometimes the music tracks will play and sometimes it will just say 'Error cannot play' is it the software or hardware??? HD1 is a hard drive I think its that blasted SonicStage that is the problem when it compresses the tracks it causes errors I am sure of it! And why should we pay for an MP3 upgrade?? Its ridiculous! I have rung Sony and am now waiting for a response about the Error, I am very close on sending my player back cos I cant stand this no more with Sony! The PS2 sucks and so does their new portables!!!